Affinage

VAMP4

Vesicle-associated membrane protein 4 · UniProt O75379

Length
141 aa
Mass
16.4 kDa
Annotated
2026-04-28
16 papers in source corpus 12 papers cited in narrative 12 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

VAMP4 is a vesicle-associated R-SNARE that functions in multiple membrane fusion events across the endomembrane system, with specialized roles in both regulated exocytosis and intracellular trafficking. Its N-terminal extension contains a di-leucine motif and acidic cluster that direct AP-1/PACS-1-dependent, clathrin-mediated recycling from the cell surface through sorting and recycling endosomes to the TGN, with casein kinase 2 phosphorylation of Ser30 enhancing AP-1 binding (PMID:14608369, PMID:12682051, PMID:17327277). At synapses, VAMP4 forms SNARE complexes with syntaxin-1/SNAP-25 that lack complexin and synaptotagmin-1 binding, selectively driving Ca²⁺-dependent asynchronous and spontaneous neurotransmitter release; its copy number on synaptic vesicles is controlled by selective retrieval via activity-dependent bulk endocytosis and sorting to endolysosomes, thereby regulating release probability (PMID:22406549, PMID:26607000, PMID:33931449, PMID:32532887). In non-neuronal cells, VAMP4 partners with Stx6/Stx7/Vti1b to mediate Golgi-to-late-endosome trafficking, is required for enlargeosome exocytosis, Golgi ribbon maintenance, NK-cell cytotoxic granule release, and dendritic recycling endosome exocytosis that differentially sorts AMPA receptors and transferrin receptors (PMID:34476885, PMID:18713833, PMID:23677696, PMID:21805468, PMID:34496238).

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 2003 High

    Identification of the N-terminal di-leucine/acidic-cluster motif as a dominant TGN-targeting signal established the structural basis for VAMP4's steady-state localization, answering how VAMP4 is distinguished from other VAMPs that lack this extension.

    Evidence Domain-swap chimeras between VAMP4 and VAMP5, site-directed mutagenesis with fluorescence microscopy in COS cells; parallel AP-1 binding assays and PACS-1 dominant-negative experiments in AtT20 cells

    PMID:12682051 PMID:14608369

    Open questions at the time
    • Structural basis for CK2 phosphorylation-dependent enhancement of AP-1 binding not resolved
    • In vivo relevance of TGN targeting in neuronal vs. non-neuronal contexts not compared
  2. 2007 High

    Tracing VAMP4's full itinerary from the plasma membrane through sorting and recycling endosomes back to the TGN resolved the recycling route and assigned distinct roles to the di-leucine motif (internalization) versus the acidic cluster (endosome-to-TGN delivery).

    Evidence Live-cell imaging of VAMP4-EGFP, antibody uptake assays, temperature blocks, and mutagenesis in HeLa cells

    PMID:17327277

    Open questions at the time
    • Coat/adaptor complexes acting at the endosome-to-TGN step not fully identified
    • Kinetic parameters of recycling not quantified
  3. 2008 High

    Demonstrating that VAMP4 is a required SNARE for enlargeosome exocytosis (with syntaxin-6 and SNAP23) established VAMP4's first known role in regulated secretion in non-neuronal cells.

    Evidence Anti-VAMP4 antibody microinjection, siRNA knockdown, capacitance measurements, and live imaging in U2OS cells

    PMID:18713833

    Open questions at the time
    • How VAMP4 is recruited to enlargeosomes is unknown
    • Whether VAMP4 participates in the Ca²⁺ sensor interaction for enlargeosome fusion is unclear
  4. 2011 Medium

    Showing that VAMP4 knockdown specifically inhibits cytotoxic granule exocytosis but not IFN-γ secretion in NK cells demonstrated cargo-selective SNARE function in immune effector cells.

    Evidence siRNA knockdown, immunofluorescence, and cytotoxicity assays in YTS and primary NK cells

    PMID:21805468

    Open questions at the time
    • SNARE partners for VAMP4 at the NK cell lytic granule not identified
    • Single knockdown study without rescue experiment
  5. 2012 High

    Discovery that VAMP4 forms SNARE complexes lacking complexin and synaptotagmin-1 binding and selectively supports asynchronous neurotransmitter release fundamentally established a molecularly distinct fusion machinery for asynchronous versus synchronous transmission.

    Evidence Biochemical SNARE complex pulldown, electrophysiology and optical imaging with VAMP4 up/downregulation in cultured hippocampal neurons

    PMID:22406549

    Open questions at the time
    • Ca²⁺ sensor driving VAMP4-dependent asynchronous release not identified
    • Whether VAMP4 SNARE complexes operate at excitatory synapses not tested in this study
  6. 2013 Medium

    Demonstrating that VAMP4 depletion fragments the Golgi ribbon without disrupting anterograde transport revealed a role in retrograde trafficking required for Golgi structural integrity, mediated by a complex including syntaxin-6, syntaxin-16, and Vti1a.

    Evidence RNAi knockdown in HeLa cells with electron microscopy, immunofluorescence, and anterograde trafficking assays

    PMID:23677696

    Open questions at the time
    • Cargo carried by VAMP4-dependent retrograde pathway not identified
    • Whether Golgi fragmentation reflects direct SNARE function or indirect effect not fully resolved
  7. 2015 High

    Identifying VAMP4 as a selective cargo of activity-dependent bulk endocytosis (ADBE) via its di-leucine motif resolved how VAMP4 is retrieved from the presynaptic surface by a pathway distinct from that used by synaptobrevin-2, linking its trafficking to synaptic activity levels.

    Evidence pHluorin reporters, ADBE genetic inhibition, bulk endosome purification, and di-leucine mutagenesis in neuronal cultures

    PMID:26607000

    Open questions at the time
    • Adaptor protein(s) recognizing the di-leucine motif during ADBE not identified
    • Fate of VAMP4 after bulk endosome generation not fully traced
  8. 2020 Medium

    Extending VAMP4's synaptic role to Ca²⁺-dependent spontaneous excitatory transmission, and showing that high-frequency stimulation augments spontaneous release in a VAMP4-dependent manner, unified asynchronous and spontaneous release under a shared VAMP4-dependent mechanism.

    Evidence siRNA knockdown and VAMP4 mutant rescue, mEPSC/mIPSC electrophysiology, high-frequency stimulation in hippocampal neurons

    PMID:32532887

    Open questions at the time
    • Molecular identity of the Ca²⁺ sensor coupling activity to VAMP4-mediated spontaneous release unknown
    • Whether VAMP4 acts at a distinct vesicle pool or a distinct release site not resolved
  9. 2021 High

    Three parallel studies in 2021 expanded VAMP4 function: (i) VAMP4 copy number on SVs regulates release probability via endolysosomal sorting during ADBE; (ii) VAMP4 mediates dendritic recycling endosome exocytosis and differentially sorts AMPAR versus TfR; (iii) VAMP4 forms a trans-SNARE complex with Stx6/Stx7/Vti1b for Golgi-to-late-endosome transport of MT1-MMP in macrophages.

    Evidence SNARE reconstitution, pHluorin imaging, endolysosomal perturbation (neurons); VAMP4 knockdown with AMPAR/TfR recycling assays and LTP electrophysiology (neurons); Co-IP of trans-SNARE complex and gelatin degradation assay (macrophages)

    PMID:33931449 PMID:34476885 PMID:34496238

    Open questions at the time
    • Mechanism by which VAMP4 is selectively sorted to endolysosomes rather than recycled to SVs not defined
    • How VAMP4-dependent sorting separates AMPAR and TfR populations in dendrites is mechanistically unclear
    • Whether Stx6/Stx7/Vti1b complex operates at synapses is untested

Open questions

Synthesis pass · forward-looking unresolved questions
  • The Ca²⁺ sensor that drives VAMP4-dependent asynchronous and spontaneous release remains unidentified, and a structural model of the VAMP4 SNARE complex explaining the exclusion of complexin and synaptotagmin-1 is lacking.
  • No crystal or cryo-EM structure of a VAMP4-containing SNARE complex
  • In vivo phenotype of VAMP4 knockout in mammals not reported
  • Relationship between presynaptic and dendritic VAMP4 pools not established

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0005198 structural molecule activity 4
Localization
GO:0005794 Golgi apparatus 5 GO:0005768 endosome 3 GO:0031410 cytoplasmic vesicle 3 GO:0005886 plasma membrane 2
Pathway
R-HSA-5653656 Vesicle-mediated transport 7 R-HSA-112316 Neuronal System 4 R-HSA-9609507 Protein localization 4 R-HSA-168256 Immune System 1
Partners
AP1M1PACS1SNAP23SNAP25STX1ASTX6STX7VTI1B
Complex memberships
VAMP4/Stx6/Stx7/Vti1b SNARE complexVAMP4/syntaxin-1/SNAP-25 SNARE complexVAMP4/syntaxin-6/SNAP-23 enlargeosome SNARE complex

Evidence

Reading pass · 12 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2012 VAMP4 forms a stable SNARE complex with syntaxin-1 and SNAP-25 that does not interact with complexins or synaptotagmin-1 (proteins essential for synchronous neurotransmission), and this distinct complex selectively maintains Ca2+-dependent asynchronous neurotransmitter release at inhibitory nerve terminals. Up- or downregulation of VAMP4 causes a correlated change in asynchronous release. VAMP4 and synaptobrevin2 traffic independently with minimal overlap. Biochemical SNARE complex pulldown, up/downregulation of VAMP4 in neurons with electrophysiological readout, optical imaging of individual synapses Nature neuroscience High 22406549
2007 VAMP4 cycles from the cell surface to the TGN via clathrin-dependent endocytosis through sorting and then recycling endosomes (not late endosomes). The di-leucine motif of the TGN-targeting signal is important for internalization, while the acidic cluster is crucial for delivery from endosome to TGN. Live-cell imaging of VAMP4-EGFP, antibody uptake assays, pharmacological and thermal perturbation, site-directed mutagenesis Journal of cell science High 17327277
2003 VAMP4 binds to AP-1 subunit mu1a (but not mu1b or GGAs) via its dileucine motif (Leu25,26) and Ser20. Phosphorylation of Ser30 in the acidic cluster by casein kinase 2 enhances AP-1 binding via PACS-1. Ablation of both the dileucine motif and Ser30, or dominant-negative PACS-1, causes dramatic mislocalization of VAMP4 in AtT20 cells. Co-immunoprecipitation, site-directed mutagenesis, dominant-negative PACS-1 expression, fluorescence microscopy EMBO reports High 14608369
2003 The N-terminal 51-residue extension of VAMP4 (containing a di-leucine motif followed by two acidic clusters) is a dominant and autonomous targeting signal sufficient to redirect VAMP5 to the TGN. The di-leucine motif and the second acidic cluster are essential for TGN targeting. Domain-swap chimeras between VAMP4 and VAMP5, C-terminal EGFP tagging, deletion and site-directed mutagenesis, fluorescence microscopy The Journal of biological chemistry High 12682051
2008 VAMP4 is localized in enlargeosome membranes and is a required component of the SNARE machinery (together with syntaxin-6 and SNAP23) mediating regulated exocytosis of enlargeosomes. Anti-VAMP4 antibody microinjection and VAMP4 siRNA both inhibit enlargeosome exocytosis. Immunolocalization, anti-VAMP4 antibody microinjection, siRNA knockdown, capacitance measurements, VAMP4-GFP live imaging Journal of cell science High 18713833
2015 VAMP4 is an essential cargo molecule for activity-dependent bulk endocytosis (ADBE) at synapses, with a cytoplasmic di-leucine motif being critical for this role. VAMP4 is selectively retrieved by ADBE and is enriched in bulk endosomes; inhibiting ADBE specifically perturbs VAMP4-pHluorin retrieval but not other SV cargo reporters. pH-sensitive pHluorin reporters in neuronal cultures, genetic inhibition of ADBE, purification of bulk endosomes with western blotting, di-leucine motif mutagenesis Neuron High 26607000
2011 In NK cells, VAMP4 colocalizes with lytic granules during cytotoxic interactions and is required for cytotoxic granule exocytosis and NK cell cytotoxic activity. VAMP4 knockdown inhibits lytic granule release but does not affect IFN-γ secretion, distinguishing its function from VAMP7. Immunofluorescence colocalization, siRNA knockdown, cytotoxicity assays in YTS cells and peripheral NK cells European journal of immunology Medium 21805468
2013 VAMP4 is required to maintain the Golgi ribbon structure. Depletion of VAMP4 by RNAi causes Golgi ribbon fragmentation (shortened stacks remaining in juxtanuclear area) without disrupting anterograde trafficking or microtubule arrays. Depletion of VAMP4 cognate SNARE partners (syntaxin 6, syntaxin 16, Vti1a) similarly disrupts the Golgi ribbon, implicating the VAMP4-containing SNARE complex in retrograde trafficking needed for Golgi integrity. RNAi knockdown in HeLa cells, electron microscopy, immunofluorescence, anterograde trafficking assays Molecular and cellular biochemistry Medium 23677696
2021 VAMP4 copy number on synaptic vesicles regulates release probability (Pr): VAMP4 has reduced ability to form efficient SNARE complexes with canonical plasma membrane SNAREs, and its high synaptic turnover is coupled to selective sorting to endolysosomes during activity-dependent bulk endocytosis. Disruption of endolysosomal trafficking increases VAMP4 abundance in the SV pool and inhibits SV fusion. SNARE complex reconstitution assay, fluorescence imaging, endolysosomal trafficking perturbation, pHluorin reporters, mass spectrometry Science advances High 33931449
2020 VAMP4 is required for Ca2+-dependent spontaneous excitatory neurotransmission in hippocampal neurons. Key residues controlling VAMP4 retrieval and functional clathrin-mediated trafficking are essential for maintaining VAMP4-mediated spontaneous release. High-frequency stimulation augments Ca2+-sensitive spontaneous release for up to 30 min in a VAMP4-dependent manner, linking asynchronous and spontaneous release. siRNA knockdown and rescue with VAMP4 mutants in hippocampal neurons, electrophysiology (mEPSC/mIPSC recording), high-frequency stimulation protocols The Journal of neuroscience Medium 32532887
2021 VAMP4 is the primary vesicular SNARE mediating dendritic recycling endosome exocytosis. VAMP4 knockdown decreases transferrin receptor (TfR) recycling but paradoxically increases AMPA receptor (AMPAR) recycling and synaptic transmission, occluding LTP, revealing that VAMP4 sorts AMPARs and TfRs into separate endosomal populations. VAMP4 knockdown in neurons, live imaging of VAMP4-labeled organelles, electrophysiology (LTP, AMPAR-mediated transmission), TfR recycling assays Cell reports Medium 34496238
2021 VAMP4 on Golgi-derived vesicles forms a trans-SNARE complex with the Q-SNARE complex Stx6/Stx7/Vti1b to mediate fusion with late endosomes, regulating transport of MT1-MMP from Golgi to late endosomes and subsequently to the cell surface in macrophages. Depletion of any SNARE in this complex reduces surface MT1-MMP and gelatin degradation. Fixed and live imaging, co-immunoprecipitation (trans-SNARE complex), siRNA knockdown, gelatin degradation assay Traffic Medium 34476885

Source papers

Stage 0 corpus · 16 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2012 VAMP4 directs synaptic vesicles to a pool that selectively maintains asynchronous neurotransmission. Nature neuroscience 126 22406549
2007 VAMP4 cycles from the cell surface to the trans-Golgi network via sorting and recycling endosomes. Journal of cell science 61 17327277
2015 VAMP4 Is an Essential Cargo Molecule for Activity-Dependent Bulk Endocytosis. Neuron 59 26607000
2003 AP-1 recruitment to VAMP4 is modulated by phosphorylation-dependent binding of PACS-1. EMBO reports 55 14608369
2008 The regulated exocytosis of enlargeosomes is mediated by a SNARE machinery that includes VAMP4. Journal of cell science 50 18713833
2005 Suicide attempt and basic mechanisms in neural conduction: relationships to the SCN8A and VAMP4 genes. American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics 41 15635639
2003 The cytoplasmic domain of Vamp4 and Vamp5 is responsible for their correct subcellular targeting: the N-terminal extenSion of VAMP4 contains a dominant autonomous targeting signal for the trans-Golgi network. The Journal of biological chemistry 39 12682051
2011 VAMP4- and VAMP7-expressing vesicles are both required for cytotoxic granule exocytosis in NK cells. European journal of immunology 32 21805468
2013 VAMP4 is required to maintain the ribbon structure of the Golgi apparatus. Molecular and cellular biochemistry 31 23677696
2021 Control of synaptic vesicle release probability via VAMP4 targeting to endolysosomes. Science advances 30 33931449
2020 VAMP4 Maintains a Ca2+-Sensitive Pool of Spontaneously Recycling Synaptic Vesicles. The Journal of neuroscience : the official journal of the Society for Neuroscience 24 32532887
2020 Analysis of DNM3 and VAMP4 as genetic modifiers of LRRK2 Parkinson's disease. Neurobiology of aging 22 32873436
2021 The vSNAREs VAMP2 and VAMP4 control recycling and intracellular sorting of post-synaptic receptors in neuronal dendrites. Cell reports 19 34496238
2021 The trans-SNARE complex VAMP4/Stx6/Stx7/Vti1b is a key regulator of Golgi to late endosome MT1-MMP transport in macrophages. Traffic (Copenhagen, Denmark) 12 34476885
2026 VAMP4/STX8 Mediate the Autophagic Secretion of Mitochondria and Promote TAMs Polarization in HNSCC. Journal of extracellular vesicles 0 41979085
2025 VAMP4 in hypoxic adipose stem cell exosomes alleviates ischemia-reperfusion injury. Cellular and molecular life sciences : CMLS 0 41460344